Thursday, 29 January 2015

Pascal Programming - Most Recent Interview Questions

41. What is the history of Pascal?
 Ans: Pascal is in the Algol family of languages. Algol, whose first version was called IAL or "International Algebraic Language", was the first language created by international committee. The resulting language was rather odd for its time. The committee had the goal of designing a unified computer language, but also saw Algol as a way to cleanly express computer algorithms, and so was not directly concerned with creating a practical language for compilation. That is, the language would serve a purpose even if it was only used for publishing algorithms, not running them.
This resulted in Algol not having many data types, or built in I/O. Also, Algol was generally free of the limits common to programming languages of that time, such as number of array dimensions. One of the goals of Algol was for it to be as close to mathematical notation as possible. In particular, Algol used a special operator for assignment, ':=', because '=' had a different meaning in mathematics.

42. What is IP Pascal?
 Ans: A. IP is an interplatform Pascal. It supports the following platforms in its current configuration:
1. Windows/95/98/ME/NT/2000/XP.
2. Linux/86.
A port for Mac OS X is under way, and a port for Sun Solaris/Sparc is planned.
IP both provides, and itself is run, on a set of porting modules that allow IP, and its client programs, to run on any of the supported platforms without source change. To move within operating systems on the same machine type, only a relink is required. To move within different CPU based systems, a recompile and link is required.

43. What are the major dialects of Pascal in use today?
 Ans: There have been many implementations of Pascal, both those that follow and those that don't follow the ISO 7185 standard. For the most part, ISO 7185 was followed on large computer installations during the early days of Pascal (1973-1990), and some installations on microcomputers. The other dialect that became popular was the UCSD (University of California at San Diego) Pascal, followed by Borland's Turbo Pascal. Although there are virtually no current implementations of UCSD Pascal, Borland's products exist today for advanced IBM-PC compatibles under Borland's Delphi name.
When the IBM-PC became 32 bit with the introduction of the Intel 80386, virtually all of the 32 bit implementations of Pascal on the PC were ISO 7185 conforming. However, there was a large shakeout of compiler vendors in the early 1990's that removed many of these installations from the market.

44. Why is the name pascal?
Ans:  Pascal was named after the French mathematician Blaise Pascal, who created a calculating machine (not a true computer).

45. What is the current status of Pascal standards?
Ans: In 1989, ISO 7185 was revised to correct various errors and ambiguities found in the original document. This resulted in ISO 7185:1990.
More Questions & Answers :-
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